02194nas a2200181   4500008004100000245009800041210006900139260000900208300001500217490000600232520160800238653002401846653002401870100001201894700002301906700001901929856006401948       2007                        eng d00aCross-attraction between an exotic and a native pine bark beetle: a novel invasion mechanism?0 aCrossattraction between an exotic and a native pine bark beetle   c2007  ae1302, 1-90 v23 aBackground. Aside from the ecological impacts, invasive species fascinate ecologists because of the unique opportunities that invasives offer in the study of community ecology. Some hypotheses have been proposed to illustrate the mechanisms that allow exotics to become invasive. However, positive interactions between exotic and native insects are rarely utilized to explain invasiveness of pests. Methodology/Principal Findings. Here, we present information on a recently formed association between a native and an exotic bark beetle on their shared host, Pinus tabuliformis, in China. In field examinations, we found that 35-40% of P. tabuliformis attacked by an exotic bark beetle, Dendroctonus valens, were also attacked by a native pine bark beetle, Hylastes parallelus. In the laboratory, we found that the antennal and walking responses of H. parallelus to host- and beetle-produced compounds were similar to those of the exotic D. valens in China. In addition, D. valens was attracted to volatiles produced by the native H. parallelus. Conclusions/Significance. We report, for the first time, facilitation between an exotic and a native bark beetle seems to involve overlap in the use of host attractants and pheromones, which is cross-attraction. The concept of this interspecific facilitation could be explored as a novel invasive mechanism which helps explain invasiveness of not only exotic bark beetles but also other introduced pests in principle. The results reported here also have particularly important implications for risk assessments and management strategies for invasive species.10aDendroctonus valens10aHylastes parallelus1 aLu, Min1 aMiller, Daniel, R.1 aSun, Jiang-Hua  uhttp://ukpmc.ac.uk/tocrender.cgi?action=archive&journal=31202083nas a2200229   4500008004100000020001400041245010000055210006900155260000900224300001700233490000600250520139400256653001501650100002301665700002601688700001901714700002001733700002001753700001801773700002401791856003801815       2011                        eng d  a1932-620300aTrees Wanted-Dead or Alive! Host Selection and Population Dynamics in Tree-Killing Bark Beetles0 aTrees WantedDead or Alive Host Selection and Population Dynamics  c2011  ae18274, 1-130 v63 aBark beetles (Coleoptera: Curculionidae, Scolytinae) feed and breed in dead or severely weakened host trees. When their population densities are high, some species aggregate on healthy host trees so that their defences may be exhausted and the inner bark successfully colonized, killing the tree in the process. Here we investigate under what conditions participating with unrelated conspecifics in risky mass attacks on living trees is an adaptive strategy, and what this can tell us about bark beetle outbreak dynamics. We find that the outcome of individual host selection may deviate from the ideal free distribution in a way that facilitates the emergence of tree-killing (aggressive) behavior, and that any heritability on traits governing aggressiveness seems likely to exist in a state of flux or cycles consistent with variability observed in natural populations. This may have implications for how economically and ecologically important species respond to environmental changes in climate and landscape (forest) structure. The population dynamics emerging from individual behavior are complex, capable of switching between ''endemic'' and ''epidemic'' regimes spontaneously or following changes in host availability or resistance. Model predictions are compared to empirical observations, and we identify some factors determining the occurrence and self-limitation of epidemics.10aScolytinae1 aKausrud, Kyrre, L.1 aGregoire, Jean-Claude1 aSkarpaas, Olav1 aErbilgin, Nadir1 aGilbert, Marius1 aOkland, Bjorn1 aStenseth, Nils, Chr  uhttp://ukpmc.ac.uk/issues/116071/02436nas a2200229   4500008004100000020001400041245013200055210006900187260000900256300001600265490000600281520167800287653002401965100002301989700002602012700002102038700002202059700002302081700002702104700002802131856004702159       2009                        eng d  a1932-620300aThermal tolerance of the coffee berry borer Hypothenemus hampei: predictions of climate change impact on a tropical insect pest0 aThermal tolerance of the coffee berry borer Hypothenemus hampei   c2009  ae6487, 1-110 v43 aCoffee is predicted to be severely affected by climate change. We determined the thermal tolerance of the coffee berry borer, Hypothenemus hampei, the most devastating pest of coffee worldwide, and make inferences on the possible effects of climate change using climatic data from Colombia, Kenya, Tanzania, and Ethiopia. For this, the effect of eight temperature regimes (15, 20, 23, 25, 27, 30, 33 and 35[degree]C) on the bionomics of H. hampei was studied. Successful egg to adult development occurred between 20[long dash]30[degree]C. Using linear regression and a modified Logan model, the lower and upper thresholds for development were estimated at 14.9 and 32[degree]C, respectively. In Kenya and Colombia, the number of pest generations per year was considerably and positively correlated with the warming tolerance. Analysing 32 years of climatic data from Jimma (Ethiopia) revealed that before 1984 it was too cold for H. hampei to complete even one generation per year, but thereafter, because of rising temperatures in the area, 1[long dash]2 generations per year/coffee season could be completed. Calculated data on warming tolerance and thermal safety margins of H. hampei for the three East African locations showed considerably high variability compared to the Colombian site. The model indicates that for every 1uC rise in thermal optimum (Topt.), the maximum intrinsic rate of increase (rmax) will increase by an average of 8.5%. The effects of climate change on the further range of H. hampei distribution and possible adaption strategies are discussed. Abstracts in Spanish and French are provided as supplementary material Abstract S1 and Abstract S2.10aHypothenemus hampei1 aJaramillo, Juliana1 aChabi-Olaye, Adenirin1 aKamonjo, Charles1 aJaramillo, Alvaro1 aVega, Fernando, E.1 aPoehling, Hans-Michael1 aBorgemeister, Christian  uhttp://ukpmc.ac.uk/tocrender.cgi?iid=71880